Persistent Anomalies of the Extratropical Northern Hemisphere Wintertime Circulation: Structure

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Abstract
In a previous study of the extratropical Northern Hemisphere wintertime circulation, significant variations were described in the occurrence of anomalies that persist beyond the durations associated with synoptic-scale variability (“persistent anomalies”). The present study extends that work by identifying the typical structures of persistent anomalies, focusing on whether persistent occur in certain key regions (the central North Pacific (PAC), the eastern North Atlantic (ATL) and the northern Soviet Union (NSU)] are related to recurrent large-scale flow patterns. For each region, detailed comparisons are provided of the flow patterns associated with persistent positive and negative anomaly cases, and with the patterns obtained in other observations and theoretical studies of persistent phenomena. The results provide evidence for the recurrence of certain preferred anomaly patterns. To a first approximation, the composite anomaly patterns of the positive and negative cases for a region can be de... Abstract In a previous study of the extratropical Northern Hemisphere wintertime circulation, significant variations were described in the occurrence of anomalies that persist beyond the durations associated with synoptic-scale variability (“persistent anomalies”). The present study extends that work by identifying the typical structures of persistent anomalies, focusing on whether persistent occur in certain key regions (the central North Pacific (PAC), the eastern North Atlantic (ATL) and the northern Soviet Union (NSU)] are related to recurrent large-scale flow patterns. For each region, detailed comparisons are provided of the flow patterns associated with persistent positive and negative anomaly cases, and with the patterns obtained in other observations and theoretical studies of persistent phenomena. The results provide evidence for the recurrence of certain preferred anomaly patterns. To a first approximation, the composite anomaly patterns of the positive and negative cases for a region can be de...

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